Burnt Exhaust Valves-How Prevalent?

bmw633 · 10-18-2012, 12:10 AM

Hi,

After my GZ250 grenaded itself with a broken-off exhaust valve, I have noticed that others have had problems with their exhaust valves, also. How common is this problem?

Someone contacted me about selling their bike with burnt exhaust valves, after 10,000 miles on the odometer, like my bike. Could this be a manufacturer defect caused by a too lean condition in the carburetor?

,

raul10141964 · 10-18-2012, 10:46 AM

could be caused by a too lean condition or by exause leack close to the head

bpdchief · 10-20-2012, 05:56 PM

Exhaust Lick??? that's got to taste nasty :puke:

**jonathan180iq** · 10-23-2012, 10:31 AM

It's not a defect.
These a simple machines, yes. But do require some things to be tightened up every now and then that most casual riders don't ever really consider, like the aforementioned header connections, carb boots and things of that nature. Being a wimpy thumper, little leaks can go unnoticed. And over time, those little leaks, that slightly extra lean condition, can overheat the valves. This is why it's also important to keep up with valve checks every now and then.

Being just slightly off, over 10,000 miles, can end up being too much.

Water Warrior 2 · 10-29-2012, 05:09 AM

Quote:

Originally Posted by jonathan180iq

It's not a defect.
These a simple machines, yes. But do require some things to be tightened up every now and then that most casual riders don't ever really consider, like the aforementioned header connections, carb boots and things of that nature. Being a wimpy thumper, little leaks can go unnoticed. And over time, those little leaks, that slightly extra lean condition, can overheat the valves. This is why it's also important to keep up with valve checks every now and then.

Being just slightly off, over 10,000 miles, can end up being too much.

All of the above plus a ride on an Interstate trying to keep up with traffic would would be a sure fire way to damage an engine.

bpdchief · 10-29-2012, 11:27 PM

Which begs the question.... Why is it ALWAYS an exhaust valve?

blaine · 10-30-2012, 12:08 AM

Quote:

Originally Posted by bpdchief

Which begs the question.... Why is it ALWAYS an exhaust valve?

Exhaust valve gets much hotter.Intake valve stays cool from incoming fuel & air.

:cool:

OldNTired · 10-30-2012, 01:13 AM

Quote:

Originally Posted by Water Warrior

Quote:

Originally Posted by jonathan180iq

It's not a defect.
These a simple machines, yes. But do require some things to be tightened up every now and then that most casual riders don't ever really consider, like the aforementioned header connections, carb boots and things of that nature. Being a wimpy thumper, little leaks can go unnoticed. And over time, those little leaks, that slightly extra lean condition, can overheat the valves. This is why it's also important to keep up with valve checks every now and then.

Being just slightly off, over 10,000 miles, can end up being too much.

All of the above plus a ride on an Interstate trying to keep up with traffic would would be a sure fire way to damage an engine.

(sigh) One small mistake and they never let you forget!!

Water Warrior 2 · 10-30-2012, 02:14 AM

Quote:

Originally Posted by OldNTired

Quote:

Originally Posted by Water Warrior

Quote:

Originally Posted by jonathan180iq

It's not a defect.
These a simple machines, yes. But do require some things to be tightened up every now and then that most casual riders don't ever really consider, like the aforementioned header connections, carb boots and things of that nature. Being a wimpy thumper, little leaks can go unnoticed. And over time, those little leaks, that slightly extra lean condition, can overheat the valves. This is why it's also important to keep up with valve checks every now and then.

Being just slightly off, over 10,000 miles, can end up being too much.

All of the above plus a ride on an Interstate trying to keep up with traffic would would be a sure fire way to damage an engine.

(sigh) One small mistake and they never let you forget!!

:lol: :lol: Just like being married, heh heh.

OldNTired · 10-31-2012, 12:04 AM

Being just slightly off, over 10,000 miles, can end up being too much.[/quote]
All of the above plus a ride on an Interstate trying to keep up with traffic would would be a sure fire way to damage an engine.[/quote]

(sigh) One small mistake and they never let you forget!!

[/quote]
:lol: :lol: Just like being married, heh heh.[/quote]

Been there, done that too. Twice. Sometimes I'm a slow learner.

10-18-2012, 12:10 AM	#1
bmw633 Junior Member Join Date: Aug 2012 Location: Moon, VA Posts: 20	Burnt Exhaust Valves-How Prevalent? Hi, After my GZ250 grenaded itself with a broken-off exhaust valve, I have noticed that others have had problems with their exhaust valves, also. How common is this problem? Someone contacted me about selling their bike with burnt exhaust valves, after 10,000 miles on the odometer, like my bike. Could this be a manufacturer defect caused by a too lean condition in the carburetor? , Login or Register to Remove Ads
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10-18-2012, 10:46 AM	#2
raul10141964 Senior Member Join Date: Apr 2012 Location: Elkhart, Indiana Posts: 369	Re: Burnt Exhaust Valves-How Prevalent? could be caused by a too lean condition or by exause leack close to the head
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10-20-2012, 05:56 PM	#3
bpdchief Senior Member Join Date: Feb 2012 Location: Ozark, MO Posts: 848	Re: Burnt Exhaust Valves-How Prevalent? Exhaust Lick??? that's got to taste nasty :puke: __________________ I'm never lost - I'm exploring alternative destinations ! Login or Register to Remove Ads
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10-23-2012, 10:31 AM	#4
jonathan180iq Super Moderator Join Date: Jan 2007 Location: Dalton, GA Posts: 3,996	Re: Burnt Exhaust Valves-How Prevalent? It's not a defect. These a simple machines, yes. But do require some things to be tightened up every now and then that most casual riders don't ever really consider, like the aforementioned header connections, carb boots and things of that nature. Being a wimpy thumper, little leaks can go unnoticed. And over time, those little leaks, that slightly extra lean condition, can overheat the valves. This is why it's also important to keep up with valve checks every now and then. Being just slightly off, over 10,000 miles, can end up being too much.
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10-29-2012, 11:27 PM	#6
bpdchief Senior Member Join Date: Feb 2012 Location: Ozark, MO Posts: 848	Re: Burnt Exhaust Valves-How Prevalent? Which begs the question.... Why is it ALWAYS an exhaust valve? __________________ I'm never lost - I'm exploring alternative destinations !
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10-31-2012, 12:04 AM	#10
OldNTired Senior Member Join Date: Mar 2012 Location: Westofhell Posts: 177	Re: Burnt Exhaust Valves-How Prevalent? Being just slightly off, over 10,000 miles, can end up being too much.[/quote] All of the above plus a ride on an Interstate trying to keep up with traffic would would be a sure fire way to damage an engine.[/quote] (sigh) One small mistake and they never let you forget!! [/quote] :lol: :lol: Just like being married, heh heh.[/quote] Been there, done that too. Twice. Sometimes I'm a slow learner.
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